Step #1 Either ask the butcher to open out the leg & remove the bone, or take a sharp knife & cut down along the bone easing the meat away, in which case your preparation time will drop to five mins, but keeping it in one piece.
Step #2 Once you have removed the bone, lay the meat on a board & make deep cuts into, but not through, the flesh to open the thickest parts out more.
Step #3 Try to keep the skin intact.
Step #4 Spice up well with salt & pepper, drizzle with oil & scatter on the thyme leaves.
Step #5 Leave to marinate in a cool place until needed.
Step #6 When you are ready to cook the lamb, before turning & cooking the other side, place it on the grill skin side down & cook for about 10 mins, also for 10 mins.
Step #7 Continue to turn & cook the meat, basting with a little extra oil until it is cooked to your liking: about 1 hr for rare, 1 1/4 hrs for pink & 1 1/2 hrs for well done.
Step #8 Take the meat from the barbecue & let it rest on a carving board for 10 mins before carving into slices.
Step #9 Serve this lamb with mint jelly & barbecued vegetables.
Step #10 --.
Enjoy the Butterflied Leg of Lamb in Yogurt Marinade recipe